First of all, I strongly recommend to quote the copied text from the CoinTelegraph article or you likely get banned (if not yet happened) for plagarism.

Second, to take up the subject, it is the figures of only one crypto gambling provider. I would not transfer the good figures of the provider to all blockchain gambling providers, because it could also be individual factors (besides COVID-19) that provided the boost. But in general, it should come as no surprise that such providers benefit from the situation. Millions of people are at home bored. Many of them (as in the USA) even receive extra high unemployment benefits, which many have invested in the stock market or in gambling. The question will be whether the good figures will remain after the lockdown period ended.